Device for dressing grinding-wheels.



S. W. NESBITT.

DEVICE FOR DRESSING GRINDING WHEELS.

APPLICATION FILED APR. 16, 1910.

Patentd Aug. 22, 1911.

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SAMUEL l/V. NESBITT, OF SPRINGFIELD, MASSACHUSETTS.

DEVICE FOR DRESSING GRINDING-WHEELS.

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Specification of Letters Patent. Patented Aug, 2,2, 1911.

Application filed April 16, 1910. Serial No. 555,958.

To all whom it may concern:

Be it known that I, SAMUEL WV. Nnsnrr'r, a citizen of the United Statesof i-Mncrica, and resident of Springfield, in the county of Hampden andState of hlassachusetts, have invented certain new and useful Improvemeats in Devices for Dressing GrindinglVheels, of which the following isa full, clear, and exact description.

The object of this invention is to produce a device for simultaneouslydressing the working faces of opposed cup shaped grinding wheels.

In certain special machinery a pair of grinding wheels are providedwhich are rotatable on arbors therefor which are axially coincident andwhich grinding wheels are movable, the one relatively to the other onthe line of their common axis so that the working faces of the cupshaped grinding wheels may simultaneously finish, by grinding, theopposite faces of any given piece of work, such, for instance, as awrench bar forging.

In the carrying out of this invention a device is provided whichconsists of a holder and a pair of rotary grinding wheel. dress ingtools which are journaled for their free rotations on the holder andhave their working portions extended and exposed beyond opposite lateralportions of the holder, so that by the presentation of the head orworking portion of the device between the grinding faces of a pair ofcup shaped grinding wheels and the positioning of the one wheel insuitable proximity to the other, both of the grinding faces of thewheels will be simultaneously dressed ,-that is they will be freshcnedand rendered more abrasive in their character after, from more or lessprotracted use, having become glazed and impaired for their mostetlicicnt surface grinding action.

The invention is described in conjunction with the accompanying drawingsand is defined in the claims.

In the drawings, Figure 1 is a plan view of the device for dressinggrinding wheels,- a portion thereof at its forward end being representedin horizontal section; Fig. 9 is an edge view of the device; Fig. 3 is aperspective view showing the detachable head for carrying the dressingtools and parts appurtenant to such head in separated relations.

Similar characters of reference indicate corresponding parts in all ofthe views.

The device will be described as the same has been specificallyconstructed and practi- :ally used, although it is to be umterstomt thatvarious changes of a minor character may be made in the device withoutdeparting from the invention.

In the drawings A represents a stock comprising a substantiallyrectangular body portion a and a handle portion Z); and 1% represents atool carrying head which is represented in the form of a block which atits rear is provided with a horizontal rib Z which has an interlockingengagement in a groove therefor in the forward edge of the stock. Thesaid head has opposite sidcwise opening recesses g g, and socket holes/L /L arranged in parallelism on lines transversely of the recesses,these socket holes being in the portions of the head both to the frontand to the rear of the recesses, and

open at the front edge of the head.

I) 1) represent studs on which the rotary dressing tools a; a; arejournal-supported. These studs are engaged through the socket holes,bottoming against the inner end of the latter and they pass through theperforated or apertured centers of the dressing tool, which latter maybe constituted by atternated disks and star shaped or radially bladedmembers as conunonly comprised in already well known dressing tools forgrinding wheels. The said studs have step shaped outer end portionswhereby shoulders at right angles to each other are produced asrepresented at i and j, the shoulders 'i being at right angles to thelengths of the studs while those j are along the lengths of the studsand located outside of the shoulders 17; and these step-shaped orshouldered ends of the studs receive engagements therewith of a singleplate or flat bar F which is held in its continen'lcnt by a screw G theshank of which passes through said plate and also through the head 13and with a screw engagement into the stock and which screw by its headhas a confining engagement against the plate to hold it i111- movably inits position as shown. This screw confined plate holds the journal studsagainst cndwise displacement and the shoulders of the screw studs whichengage the end edges of the plate in turn prevent the latter from havingany rotative shifting movement, while the screw serves the double dutyof securing the plate on the head and confining the head on the stock.

By the means of detachable connection shown and last above referred to,new or different sized dressing tools may be replaced in the head and ahead of one width, or having dressing tools of a given operative naturemaybe substituted on the stock for one of some other size or nature ofequipment.

I am aware that a device for dressing emery wheels has been proposedhaving at the forward end of the handle or holder a pair of dressingtools which are of dissimilar character, one being for rough dressingand the other for fine dressing, and both projecting as to workingportions thereof beyond the end or head of the holder; but such a devicecould not possibly be used for simultaneously dressing the grindingfaces, each having the shape of an annulus, of two oppositely locatedcup shaped wheels, as represented at y and y in Fig. 1 of the accompanying drawing. And somewhat further explaining the manner ofutilization of the present device, it will be understood that thegrinding wheel 1 is mounted for its rotation on a carriage which isbodily movable toward and away from the grinding wheel y. Now the stockis supported on a rest .2 so that its forward end having the.

tool carrying head is in presentation be tween the annular faces of thetwo cup shaped grinding wheels, and the one 3 is moved against theadjacent dressing tool and will be dressed thereby and by the contact ofthe grinding wheel y against the tool the device will be bodily crowdedagainst the further grinding wheels annular face to simultaneouslyeffect the dressing of the latter. And it is to be particularlyappreciated that it is of importance in the making of this device thatthe working por tions of the dressing tools 00 w protrude beyondopposite lateral portions of the holder therefor.

I claim 1. A device for simultaneously dressing the working faces ofopposed cup-shaped grinding-wheels, consisting of a holder, and a pairof rotary dressing tools journaled on the holder, and having theirworking portions extended beyond opposite lateral portions of theholder.

2. In a grinding wheel dressing device, the combination with a holderhaving recesses in the forward portion thereof which open to oppositelateral edge portions of the holder, of rotary dressing tools journalsupported in said recesses, with their working portions protrudingoutwardly from said recesses and beyond the opposite lateral edges ofthe holder.

3. In a device for dressing grinding wheels, in combination, a stock anda head having rib and groove engagements and said head hav ing oppositesidewise opening recesses and socket holes arranged transversely of therecesses, rotary stone dressing tools located in said recesses andhaving their working portions extending outwardly beyond the endsthereof, ournal studs engaged in said socket holes and on'which therotary dress ing tools are supported and which studs have step shapedouter end portions, a plate which by its opposite ends engages the stepshaped ends of said journal studs, and a screw the shank of which passesthrough said plate, said head and with a screw engagement into thestock, and which by its head has a confining engagement against theplate.

Signed by me at Springfield, Mass, in presence of two subscribingwitnesses.

SAMUEL WV. NE SBITT.

Witnesses WVM. S. BELLoWs, G. R. DRISCOLL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G.

